html,body {
	padding: 0;
	margin: 0;
	/* background-color: blue; */
}

ul, li {
	padding: 0;
	margin: 0;
	list-style: none;
}

#app {
	position: absolute;
	width: 100px;
	height: 100px;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	border: 1px solid #000;
}